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  • Title: Roseibium algae sp. nov., isolated from a marine alga (Grateloupia sp.).
    Author: Fan J, Liu X, Wang Z, Cui N, Zhang Y, Zhang Y, Song J, Li T, Wang Y.
    Journal: Int J Syst Evol Microbiol; 2024 Jul; 74(7):. PubMed ID: 39073406.
    Abstract:
    A novel Gram-stain-negative, rod-shaped, non-spore-forming, aerobic, motile bacterium with a single polar or subpolar flagellum, designated strain H3510T, was isolated from marine alga collected on sea shore of Yantai, PR China. The organism grew optimally at 28 °C and pH 7.0 and in presence of 3.0 % (w/v) NaCl. The strain exhibited positive catalase activity but negative oxidase and nitrate reduction activities. The predominant cellular fatty acids were C18 : 1  ω7c and/or C18 : 1  ω6c, 11-methyl C18 : 1  ω7c, and C16 : 0. Additionally, the major polar lipids were phosphatidylglycerol, phosphatidylmonomethylethanolamine, diphosphatidylglycerol, and phosphatidylethanolamine; the respiratory quinone was ubiquinone 10 (Q-10). The genomic DNA G+C content of strain H3510T was 54.2%. The novel strain showed the closest relationship with Roseibium polysiphoniae KMM 9699T with 98.2 % 16S rRNA gene sequence similarity. The calculated values for average nucleotide identity and DNA-DNA hybridization between strain H3510T and the phylogenetically related Roseibium species were in the range of 71.3-74.9 % and 13.7-19.9 %, respectively. Based on polyphasic analyses, strain H3510T was identified as representing a novel species of the genus Roseibium, for which the name Roseibium algae sp. nov. is proposed. The type strain is H3510T (=KCTC 8206T=MCCC 1K04325T). The heterologously expressed inositol 2-dehydrogenase gene from strain H3510T displayed high oxidation activity on myo-inositol and showed potential in the production of rare stereoisomers of inositol, such as scyllo-inositol.
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